Fujitsu AUXG36LRLB, RCG30LRLB, AUXG30LRLB, AUXG54LRLB, RCG36LRLB Service Instruction

SPLIT TYPE
ROOM AIR CONDITIONER

Cassette type

Models Indoor unit Outdoor unit

AUXG30LRLB
AUXG36LRLB
AUXG45LRLB
AUXG54LRLB

AO*G30LBTA
AO*G36LBTA
AO*G45LBTA

INVERTER

SERVICE

INSTRUCTION

R410A

AO*G54LBTA

RCG30LRLB
RCG36LRLB
RCG45LRLB
RCG54LRLB

ROG30LBTA
ROG36LBTA
ROG45LBTA
ROG54LBTA

CONTENTS

1. SPECIFICATIONS

1. DESCRIPTION OF EACH CONTROL OPERATION

1-1 COOLING OPERATION............................................................................................

1-4 AUTO CHANGEOVER OPERATION........................................................................

1-5 INDOOR FAN CONTROL.........................................................................................

1-7 OUTDOOR FAN CONTROL

1-6. AIR FLOW DIRECTION CONTROL...................

......................................................................................

...................................................................

1-8 COMPRESSOR CONTROL......................................................................................

01-01

1-2 HEATING OPERATION.............................................................................................

01-02

1-3 DRY OPERATION......................................................................................................

01-03

01-04

01-06

01-09

01-11

01-10

1-9 TIMER OPERATION CONTROL...............................................................................

01-13

1-10 ELECTRONIC EXPANSION VALVE CONTROL......................................................

01-17

1-11 TEST OPERATION CONTROL...............................................................................

01-17

1-12 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST)....................................

01-17

1-13 4-WAY VALVE EXTENSION SELECT....................................................................

01-17

1-14 AUTO RESTART.....................................................................................................

01-18

1-15 PUMP DOWN..........................................................................................................

01-18

1-16 COMPRESSOR PREHEATING...............................................................................

01-20

1-17 10°C HEAT OPERATION........................................................................................

01-20

1-21 VARIOUS PROTECTIONS......................................................................................

01-24

1-22 LOW NOISE OPERATION .......................................................................................

01-27

1-24 HUMAN SENSOR(OPTION) ...................................................................................

01-28

1-20 OFF DEFROST OPERATION CONTROL...............................................................

01-23

1-19 DEFROST OPERATION CONTROL.......................................................................

01-21

1-18 ECONOMY OPERATION........................................................................................

01-20

1-23 PEAK CUT OPERATION .........................................................................................

01-28

1-25 DRAIN PUMP OPERATION............. .........................................................................

01-29

2-1 ERROR DISPLAY......................................................................................................

2. TROUBLE SHOOTING

2-2 TROUBLE SHOOTING WITH ERROR CODE

..........................................................

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

....................................................

2-4 SERVICE PARTS INFORMATION

............................................................................

02-01

02-29

02-03

02-34

1-26 DESCRIPTION OF DISPLAY UNIT .........................................................................

01-30

1 . DESCRIPTION OF EACH
CONTROL OPERATION

R410A

INVERTER

Cassette type

1-1. COOLING OPERATION

1-1-1 COOLING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 6.0°C higher than a set temperature,

the compressor operation frequency will attain to maximum performance.

* If the

room temperature is 1.0°C lower than a set temperature, the compressor

will be stopped.

* When the room temperature is between +6.0°C to -1.0°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Fig.1 based on the
fan speed mode and the outdoor temperature.

minimum
frequency

maximum
frequency

16rps 90rps

30,36LBTA

16rps 100rps

45LBTA

16rps 110rps

54LBTA

Hi Me Lo Qu

72rps

65rps
50rps

44rps 39rps

59rps 50rps

50rps 44rps

35rps

39rps

39rps

A zone
B zone
C zone
D-F zone

30,36LBTA

( Table 1 : Compressor Frequency Range )

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )

01-01

93rps
93rps
78rps
73rps

56rps 47rps

75rps
75rps

68rps
68rps

68rps 56rps

29rps

44rps
44rps
44rps

A zone
B zone
C zone
D-F zone

Fan speed mode

Outdoor air
temperature

A zone

B zone

C zone

D zone

E zone

F zone

When the room
temperature rises

When the room
temperature drops

36°C

32°C

21°C

12°C

2°C

34°C

30°C

19°C

10°C

0°C

45LBTA

72rps 59rps 50rps 39rps

100rps
100rps
85rps
76rps

62rps 50rps

78rps
78rps

73rps
73rps

73rps 62rps

29rps

44rps
44rps
44rps

A zone
B zone
C zone
D-F zone

54LBTA

01-02

1-2. HEATING OPERATION

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.

* If the room temperature is lower 6.0°C than a set temperature,

the compressor operation frequency will attain to maximum performance.

* If the room temperature is higher 1.0°C than a set temperature, the compressor

will be stopped.

* When the room temperature is between +1.0°C to -6.0°C of the setting temperature,

the compressor frequency is controlled within the range shown in Table2.

( Table 2 : Compressor Frequency Range )

minimum
frequency

maximum
frequency

16rps 90rps

30,36LBTA

16rps 110rps

45,54LBTA

MODEL

1-3. DRY OPERATION

1-3-1 INDOOR UNIT CONTROL

The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.

( Table 3 : Compressor frequency )

( Fig.2 : Compressor Control based on Room Temperature )

01-03

Ts : Setting temperature

Ts+0.5°C

Ts+1.5°C

Operating frequency

39rps

X zone

J

30,36LRLB

zone

0rps

44rps

0rpsY zone

Room Room
temperature temperature

X zone

J zone

Y zone

Ts-1.5°C

Ts-0.5°C

( Fig.3 : Indoor Fan Control )

10 30 60 360 120 360 120 10 30 (sec)

OFF

S-Lo

Lo

OFF

Setting air flow

Compressor

ON

45,54LRLB

1-4. AUTO CHANGEOVER OPERATION

01-04

When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, and Monitoring mode. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 0.5°C (wireless and 2WIRE remote controller)
Or 1.0°C(3WIRE remote controller) steps.

When operation starts, indoor fan and outdoor fan are operated for around 1 minutes.
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>

( Table 4 : Operation mode selection table )

Room temperature (TR)

TR> Ts+2°C

Ts+2°C TR Ts -2°C

*Middle zone

TR < Ts -2°C Heating

When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.

When the middle zone is selected on the predetermining of the operation mode, the operation mode
before the changing to the monitor mode is selected.

1

2

3

1

( Fig.4 : Outdoor temperature zone selection )

Cooling

Operation mode

Temperature

25

°C and over

25°C under

Heating

Cooling

Mode

*If it's Middle zone, operation mode of indoor unit is selected as below.

(1). Same operation mode is selected as outdoor unit.

If outdoor unit is operating in Cooling and Heating mode,
indoor unit will be operated by the same operation mode.

(2). Selected by the outdoor temperature.

If outdoor unit is operating in other than Cooling and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.

TR : Room temperature
Ts : Setting temperature

01-05

START

Room temp.

Ts+2

°C?

COOLING OPERATIONHEATING OPERATION

YES

Auto change over is

second or more?

NO

NO

YES

NO

NO

AUTO CHANGEOVER operation flow chart

TS : Setting temperature

Room temp.

Ts -2

°C?

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

System stops

or operation command other than

auto changeover operation?

Middle zone

NO

NO

Operation mode of

outdoor unit : Cooling?

YES

NO

Operation mode of outdoor unit

: Heating?

YES

NO

YES

Outdoor temperature<

25°C?

NO

YES

YES

YES

NO

YES

YES

Operation mode

before the monitor mode is

cooling mode?

Monitor mode

1-5. INDOOR FAN CONTROL

1. Fan speed

( Table 5 : Standard of Indoor Fan Speed )

2. FAN OPERATION

*The following fan speed is a standard value.

The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor
fan only runs.
When [AUTO] is selected, the indoor Fun motor runs MED.

01-06

Operation
mode

Air flow

mode

HIGH

MED+

LOW

Heating

Quiet

Cooling

560

420

300

420

270

470

530

660

430

660

560

510

430

300

430

270

510

600

700

470

700

590

530

470

300

470

270

530

630

HIGH

MED

LOW

Quiet

*Soft Quiet

S-Lo

FAN

Dry

3. COOLING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.5.
On the other hand, if switched in [HIGH] ~ [LOW], the indoor motor will run at a constant airflow of [COOL]
operation modes LOW, MED, HIGH,as shown in Table 5.

( Fig.5 : Airflow change - over ( Cooling : AUTO ) )

When the room
temperature rises

When the room
temperatu

re drops

TR : Room temperature
Ts : Setting temperature

TR-Ts > 2°C

=

1°C > TR-Ts

2°C > TR-Ts > 1°C

=

TR-Ts > 2.5°C

=

1.5°C > TR-Ts

2.5°C > TR-Ts > 1.5°C
=

HIGH mode

MED mode

LOW mode

*1

*1 : Contains a condition to the following

When the operation mode is set to AUTO mode
at the start of operation.
When the setting temperature was changed.
When the operation mode was changed to COOLING mode.
When the airflow mode was changed to AUTO mode.

Speed (rpm)

30LRLB 36LRLB 45LRLB

560

420

470

510

MED

510

560

590

Cool air prevention

300

300 300

54LRLB

740

480

740

630

570

480

300

480

270

570

680

630

300

*Note, during Economy operation and operation mode is FAN, the air flow is 1 step downs.
(Hi > Me, Me > Lo, Lo > Quiet, Quiet > Soft Quiet)

4. HEATING OPERATION

Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature,
as shown in Fig.6.

On the other hand, if switched in [HIGH] ~ [LOW], the indoor motor will run at a constant airflow
of [HEAT] operation modes LOW, MED, HIGH as showin in the Table 5.

6. DRY OPERATION

Refer to the Table 5
During the dry mode operation, the fan speed setting can not be changed.

01-07

Indoor heat exchanger
t

emperature

( Fig.6 : Airflow change - over ( Heating : AUTO ) )

TR-Ts > -1.0°C

=

-2.0°C > TR-Ts

1.0°C > TR-Ts > -2.0°C
=

TR-Ts > -1.5°C

=

-2.5°C > TR-Ts

-1.5°C > TR-Ts > -2.5°C
=

LOW mode

MED mode

HIGH mode

5. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Fig.7, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode.

( Fig.7 : Cool Air Prevention Control )

Cool air
prevention

S-Lo

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

42°C

30°C

34°C

Indoor heat exchanger
temperature rises

Indoor heat exchanger
temperature drops

Hi

*Me+
or setting fan mode

*Lo
or setting fan mode

39°C

37°C

37°C

32°C

24°C

*Lower speed is selected.

13 min. later

01-08

Compressor

ON

OFF

Indoor fan
Setting air flow

OFF

10 30 60 180 60 180 60 10 30

(sec)

S-Lo

480rpm

( Fig 8 : Indoor Fan Control)

7. FAN CONTROL FOR ENERGY SAVING

When the air flow setting except AUTO mode, the indoor fan motor will run as shown in Fig.8.

( Factory setting)

Setting Description Function Number Setting Value

Disable

Enable

Remote controller

49

02

00

01

00 : When the outdoor unit is stopped, the indoor unit fan operates continuously following
the setting on the remote controller.

01 : When the outdoor unit is stopped, the indoor unit fan operates intermittently at a very
low speed.
02 : Enable or disable this function by remote controller setting.

Set to “00”or “01”when connecting a remote controller that cannot set
the Fan control for energy saving function or connecting a network converter.

To confirm if the remote controller has this setting,
refer to the operating manual of each remote controller.

8. DEFROST OPERATION

When the defrost operation starts, the indoor fan runs according to cool air prevention control for 20 seconds.
And the fan is stopped if 20 seconds have passed.
When 60 seconds have passed after defrost operation is released,
the fan runs according to cool air prevention control.

To independently can be set the airflow pattern of each louver as this image.

Individual control

All louver control

This function is given priority to overall louver control.
But this function is release during the following operation.

Cold air prevention control

Monitor mode on the auto change over operation

Defrost operation

*When the 2 wire remote controller is disconnected, clear the individual setting.
Otherwise, this setting can’t change.

All louver operation

*Setting of the wireless remote controller is not displayed on the wired remote controller.

*The setting louver of the individual control function cannot be controlled.

Cooling mode standard position: 2

Dry mode standard position: 2

When the mode is selected, the standard
louver position of the each mode is set.

Monitor mode position: 2

Heating standard position Model 30,36 : 4 / Model 45,54 : 3

The air direction range will change as follows:

Use the wired remote controller to set this function.
This function is only available by 2 wire remote controller.

(Fig.11 : Air Direction Range)

(Fig.10 : Independent louver control image)

01-09

1-6. AIR FLOW DIRECTION CONTROL

1-7. OUTDOOR FAN CONTROL

1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

*

The outdoor fan speed changes in the range mentioned above depending on the compressor
frequency and outdoor temperature.
(When the compressor frequency and outdoor temperature increase, the outdoor fan speed
also changes to the higher speed.
When the compressor frequency and outdoor temperature decrease, the outdoor fan
speed also changes to the lower speed.)

*

It runs at 500rpm for 20 seconds after starting up the outdoor fan.
However, the fan operates at 200rpm when the initial rotation speed is 300rpm or less.

01-10

( Table 6 : Fan speed of the outdoor unit )

900/ 800/ 620/ 550/ 500/ 450/ 400/
320/ 300/ 250/ 200

900/ 850/ 800/ 620/ 550/ 450

900/ 850/ 800/ 620/ 550/ 450

850/ 800/ 620/ 550/ 500/ 450/ 400/
320/ 300/ 250/ 200

Cooling

Heating

30LBTA

850(800)/ 780(750)/ 750(700)/ 540(520)/
360(340)/ 290(270)/ 480(0)/ 400(0)/
350(0)/ 280(0)

Upper fan(Lower fan)

45,54LBTA

After operating the defrost control function on heating mode except economy operation,
its speed becomes 900 (Lower:880) rpm regardless of the compressor speed.
However, it returns to the normal speed control when the defrosting operation does not function
for 240 minutes after releasing the defrost operation or when the outdoor temperature sensor
detection value becomes higher than 5

*

The compressor and the fan start-up at the same time, and the fan stops after the compressor
stops and 60 seconds has passed.

*

The fan doesn't operates fan 10 seconds after the fan stops.

*

36LBTA

900(880)/ 850(830)/ 780(750)/ 720(700)/
570(550)/ 500(480)/ 370(350)/ 300(280)/
220(200)

rpm

°C.

MODEL

1-8. COMPRESSOR CONTROL

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in Fig.9.

(Fig.9 : Compressor Control at Start-up)

30

60

47

60

120 180

(rps)

Upper

limit

speed

(sec)Elapsed time

30

60

47

60

180

(rps)

Upper

limit

speed

(sec)Elapsed time

< Normal start-up Coolling/ Dry >

<Immediate start-up after power-ON / Heating>

240

30,36LBTA

1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in Table 7.

Coolin/Dry/Heating

Min

Max

(Table 7 : Compressor Operation Frequency Range)

30,36LBTA

16rps 90rps

01-11

MODEL

01-12

Upper
limit
speed

Elapsed time

Elapsed time

Ta : Outdoor temperature
Tc : Compressor temperature

< Normal start-up >

90

39

57

68

85

180 420 480

(sec)

(rps)

Condition

Mode: Cooling

Mode: Heating

Tc > 15

Below 3 hours from comp stop

°C

Mode: Heating

Ta > 10

Below 3 hours from comp stop

3 hours longer from comp stop

°C

Ta > 10

°C

3 hours longer from comp stop

Ta < 10

°C

Tc < 15

°C

Mode: Heating

Ta < 10

Below 3 hours from comp stop

°C

Tc < 15

°C

Upper
limit
speed

200 700 840 1,010

(sec)

(rps)

39

57

68

85

Condition

Condition

=

=

=

Upper
limit
speed

90 210 270 300

(sec)

(rps)

39

57

68

85

1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode
shown in Table 8.

Cooling i gnitaeH

Min Max

Min Max

(Table 8 : Compressor Operation Frequency Range)

16rps 100rps 45LBTA

54LBTA

16rps 110rps

16rps 110rps 16rps 110rps

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in Fig.10.

(Fig.10 : Compressor Control at Start-up)

45,54LBTA

< Immediate / under specific conditions start-up>

MODEL

1-9. TIMER OPERATION CONTROL

1. ON / OFF TIMER

OFF timer : When the clock reaches the set time, the air conditioner will be turned off.

Operation mode

Stop mode

Set time of timer

ON timer : When the clock reaches the set time, the air conditioner will be turned on.

Operation mode

Stop mode

Set time of timer

The weekly timer allows up to two ON and OFF time to set up per day.

Use this timer function to set operating time for each day of the week.

Operation mode

The operating time can be set in 30 min increments only.
The OFF time can be carried over to next day.
The ON timer and the OFF timer functions cannot be set with using the weekly timer.

Both ON and OFF time must be set.

2. WEEKLY TIMER

2-1. WEEKLY TIMER

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

01-13

UTY-RNR*Z1(2 wire remote controller)

1-9-1 Wired Remote Controller

ON / TIMER

*3 wire remote controller can be connected

If 3 wire remote controller is connected, set the DIP-SW on the controller PCB

Refer to the installation manual for detailed.

Sleep timer
Timer
10°C heat operation

If used in combination with wireless and wired remote controller, the following function is limited.

OFF / TIMER
WEEKLY TIMER

01-14

The DAY OFF setting is only available for days for which weekly settings already exist.

The DAY OFF setting can only be set one time. The DAY OFF setting is cancelled automatically
after the set day has passed.

Normal

Next day setting

If the operating time carries over to the next day (during a next day setting), the effective
DAY OFF range will be set as shown below.

2-2. DAY OFF setting

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

Preceding day Next day

DAY OFF

Stop mode

Stop mode

Operation mode

Stop mode

Operation mode

DAY OFF

Setting day

Preceding day Next daySetting day

01-15

AR- REJ1E

1. ON / OFF TIMER

OFF timer : When the clock reaches the set time, the air conditioner will be turned off.

Operation mode

Stop mode

Set time of timer

ON timer : When the clock reaches the set time, the air conditioner will be turned on.

Operation mode

Stop mode

Set time of timer

2. PROGRAM TIMER

ON / TIMER
OFF / TIMER

PROGRAM TIMER

SLEEP TIMER

The program timer allows the OFF timer and ON timer to be used in combination one time.

Operation mode

Operation will start from the timer setting (either OFF timer or ON timer)
whichever is closest to the clock's current timer setting.
The order of operations is indicated by the arrow in the remote control unit's display.

SLEEP timer operation cannot be combined with ON timer operation.

Stop mode

Stop mode

Stop mode

Operation mode

Operation mode

Set time

Set time Set time Set time

1-9-2 Wireless Remote Controller (OPTION)

01-16

3. SLEEP TIMER

If the sleep timer is set, the room temperature is monitored and the operation is stopped automatically.
If the operation mode or the set temperature is change after the sleep timer is set, the operation is
continued according to the changed setting of the sleep timer from that time ON.

Set temperature rises

( Ts : Set temperature )

Stop of operation

Set temperature lowers

( Ts : Set temperature )

Ts

Stop of operation

In the COOLING operation mode

When the sleep timer is set, the setting temperature is increased 1 degC.
It increases the setting temperature another 1 degC after 1 hour.
After that, the setting temperature is not changed and the operation is stopped at the time
of timer setting.

Ts

+1°C

+2°C

-2°C

-1°C

-4°C

-3°C

Set

60min

In the HEATING operation mode

When the sleep timer is set, the setting temperature is decreased 1 degC.
It decreases the setting temperature another 1 degC every 30 minutes.
Upon lowering 4 degC, the setting temperature is not changed and the operation stops
at the time of timer setting.

Set

30min

60min

90min

1-10. ELECTRONIC EXPANSION VALVE CONTROL

The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor
and the outdoor temperature sensor.

The pulse range of the electronic expansion valve control is
53 ~ 480 pulses (Cooling) and 40 ~ 480 pulses (Heating).

The pulse range of the electronic expansion valve control is
53 ~ 480 pulses (Cooling) and 53 ~ 480 pulses (Heating).

At the time of supplying the power to the outdoor unit, the initialization of the electroni

c

expansion valve is operated (528 pulses are input to the closing direction).

The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.

At the time when the air conditioner is switched from the cooling mode to heating mode,
the compressor is stopped, and the 4-way valve is switched in 3 minutes later
after the compressor stopped.

1-12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

1-13. 4-WAY VALVE EXTENSION SELECT

01-17

30,36LBTA

45,54LBTA

1-11. TEST OPERATION CONTROL

Touch the [Test run] in the “Maintenance” screen.

The “Test Run” screen is displayed.
Touch [OK] to return to the Maintenance screen, and start the test run.
The test run will automatically end is approximately 60 min.
If you wish to cancel the test run before it is complete, return to the “Monitor Mode screen”, and touch
the On/Off button.

(Installer password* is required.)

*If the password has been changed from the default setting “0000”,
please contact the installer.

With Wired Remote Controller

Under the condition where the air conditioner runs, press the TEST RUN button, and
the test operation control mode will appear.
During test running, the Operation LED and Timer LED of the air conditioner body blinks simultaneously.
Set the test operation mode, and the compressor will continue to run regardless of whether the room
temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

With Wireless Remote Controller

01-18

1-15. PUMP DOWN For Model 30,36

When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically resumed with

the memorized operation contents.
When the power is interrupted and recovered during timer operation, timer operation is canceled,
but only setting time is memorized.

[Operation contents memorized when the power is interrupted]

Operation mode

Air flow direction (Swing setting)

Individual air flow direction (Swing setting)

Human sensor auto saving (setting/timer)

Human sensor auto off (setting/timer)

Energy saving setting

Set temperature

Set air flow

Timer mode and timer time (Set by wireless remote controller)

10°C HEAT (Wireless remote controller is in use)

Each central setting

ECONOMY

1-14. AUTO RESTART

1-15. PUMP DOWN For Model 45,54

01-19

WARNING

Never touch electrical components such as the terminal blocks except the button on
the display board. It may cause a serious accident such as electric shock.

During the pump-down operation, make sure that the compressor is turned off
before you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way
or 3-way valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.

CAUTION

Perform the pump down operation before disconnecting any refrigerant pipe or
electric cable.

Collect refrigerant from the service port or the 3-way valve if pump down cannot be
performed.

In case of a group control system installation, do not turn the power off pump down is
completed in all outdoor units.
(Group control system installation described in “SPECIAL INSTALLATION
METHODS” in the installation manual of the indoor unit.)

Please check the refrigerant circuit for any leaks before starting the pump down
operation.
Do not proceed with the pump down operation if there is no refrigerant left in the
circuit due to bent or broken piping.

Operate “PUMP DOWN” • button on the display board in the manner described
below.

LED display part

Button part

14.1. Preparation for pump down

Confirm that the power is off, and then open the service panel.•

14.2. Pump down procedure

(1) Check the 3-way valves (both the liquid side and gas side) are opened.

(2) Turn the power on.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

●○○ ○○○○○

Sign “○”: Lights off, “●”: Lights on

(3) Press “PUMP DOWN” button for 3 seconds or more after 3 minutes after power on.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

●○● ○○●●●

Sign “○”: Lights off, “●”: Lights on
LED display lights on as shown in the above figure, and the fans and the

compressor start operating.

eht ,gnitarepo si rosserpmoc eht elihw desserp si nottub ”NWOD PMUP“ • eht fI

compressor will stop, then start again in about 3 minutes.

(4) LED display will change as shown below about 3 minutes after the compressor

starts. Fully close the 3-way valve on the liquid pipe side at this stage.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

●○● ○○○●●

Sign “○”: Lights off, “●”: Lights on

If the valve on the liquid pipe side is not closed, the pump down cannot be •
performed.

(5) When LED display changes as shown in the below figure, close the 3-way valve on

the gas pipe side tightly.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

●○● ○○○○●

Sign “○”: Lights off, “●”: Lights on

If the valve on the gas pipe side is not closed, refrigerant may flow into the piping •
after the compressor stops.

Step (5)

Closing direction

Step (4)

Hexagon wrench

Liquid pipe

Gas pipe

Closing direction

(6) LED display changes after 1 minute as shown in the figure below.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

●○● ○○○○○

Sign “○”: Lights off, “●”: Lights on
Fans and compressor stop automatically.

If the pump down is successfully completed (the above LED display is shown), the •
outdoor unit remains stopped until the power is turned off.

(7) Turn the power off.

POWER/

MODE

ERROR

PUMP

DOWN

LOW

NOISE

PEAK

CUT

(L1) (L2) (L3) (L4) (L5) (L6)

○○○ ○○○○○

Sign “○”: Lights off

PUMP DOWN is completed.

(Note)

To stop pump down, press the “PUMP DOWN” button again.•
To start the pump down again after the compressor is automatically stopped due to an •
error, turn the power off and open the 3-way valves. Wait 3 minutes, turn the power on
and start the pump down again.

When starting the operation after completion of the pump down, turn the power off, •
and then open the 3-way valves. Wait 3 minutes, turn the power on and perform a test
run in the “COOL” operation mode.

If an error occurs, recover the refrigerant from service port.•

1-16. COMPRESSOR PREHEATING

When the outdoor temperature is lower than 20°C and the all operation mode has been
stopped for 30 minutes, power is applied to the compressor and the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started and when the outdoor temperature rises to 26°C or greater,
preheating is ended.

1-17. 10°C HEAT OPERATION

The 10°C HEAT operation
The 10°C HEAT
The 10°C HEAT

operation can be set by the wireless remote controller.

functions by pressing 10°C HEAT button on the remote controller.

operation is almost the same operation as below settings.

Mode Heating

Setting temperature 10°C

Fan mode AUTO

( Table9 )

1-18. ECONOMY OPERATION

The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
The ECONOMY operation is almost the same operation as below settings.

Mode Cooling/ Dry Heating

Target temperature Setting temp.+1°C Setting temp.-1°C

( Table10)

01-20

1-19. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

Integratingdefrost

(Constant monitoring)

If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions becomes as shown in Table 14.

( Table 14 : Condition of defrost release )

Release Condition

Outdoor heat exchanger temp. is higher than 12°C
or
Compressor operation time has passed 15 minutes.

The defrost operation starts as shown in the following Table 11, 12, and 13.

From 2nd and later

defrost after

starting operation

Less than 35 minutes More than 35 minutes

Does not operate

Compressor integrating operation time

( Table 11 : Condition of 1st defrost operation)

1st defrost

after

starting operation

Compressor integrating operation time

Less than 22 minutes More than 22 minutes More than 62 minutes

Does not operate

Outdoor heat exchanger temp.

Below -9°C

Outdoor heat exchanger temp.

Below -10°C

Outdoor heat exchanger temp.

Below -5°C

More than 240 minutes

( For long continuous operation )

Less than 10 minutes

( For

intermittent operation )

Compressor integrating operation time

Outdoor heat exchanger temp.

Below -3°C

OFF count of the compressor

40 times

( Table 13 : Condition of Integrating defrost operation)

( Table 12 : Condition of 2nd defrost operation)

01-21

01-22

3. Defrost Flow Chart

The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.

(Not defrosted for 10 minutes)

Heating operation start : Compressor ON

Outdoor heat exchanger temp.: Over 12°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

Compressor
integrating
operation:
Over 22 minutes

Compressor
integrating
operation:
Over 62 minutes

Outdoor
heat exchanger
temp.:
Below - 9°C

Outdoor
heat exchanger
temp.:
Below - 5°C

Compressor
integrating
operation:
Over 35 minutes

2nd and later defrost

Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
36 sec later compressor : ON

Compressor
integrating
operation:
Over 240 minutes

Integrating defrost

(Constant monitoring)

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF

Defrost start

Outdoor
heat exchanger
temp.:
Below - 10°C

Outdoor
heat exchanger
temp.:
Below - 3°C

Compressor
OFF count :
40 times

1st defrost

1-20. OFF DEFROST OPEARTION CONTROL

01-23

1. OFF DEFROST OPERATION CONDITION

When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat
exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.

In heating o

peration, the outdoor heat exchanger temperature is less than -4°C, and

compressor operation integrating time lasts for more than 30 minutes.

OFF Defrost Flow Chart

Heating operation stop

Outdoor heat exchanger temp. :
Below -4°C
and
Compressor integrating operation :
Over 30 minutes

Defrost start

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF

Outdoor heat exchanger temp. : Over 12°C

or

Compressor ON time : Maximum 15 minutes

Defrost end

2. OFF DEFROST RELEASE CONDITION

Release Condition

Outdoor heat exchanger temp. is higher than 12°C
or
Compressor operation time has passed 15 minutes.

( Table 15 : OFF Defrost Release Condition )

OFF defrost operation is released when the conditions becomes as shown in Table 15.

1-21. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION CONTROL

The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.

When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 10rps(30,36) 14rps(45,54), and it continues to decrease the frequency for 10/14rps every

120 seconds until

the temperature becomes lowe

r than Temperature .

When the discharge temperature becomes lower than Temperature , the control of
the compressor frequency is released.

When the discharge temperature becomes higher than Temperature ,the compressor is stopped
and the indoor unit LED starts blinking.

(Table16 : Discharge Temperature Over Rise Prevention Control / Release Temperature)

01-24

The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.

2. CURRENT RELEASE CONTROL

30LBTA 36LBTA

104°C 101°C 110°C

Temperature

Temperature

Temperature

30,36LBTA

45,54LBTA

[ Heating ]

T0 : Outdoor Temperature

[ Cooling ]

T0 (Control / Release)

9.0A / 8.5A

10.0A / 9.5A

12.5A / 12.0A

14.5A / 14.0A

50°C

46°C

40°C

T0 : Outdoor Temperature

[ Cooling ]

T0 (Control / Release)

9.0A / 8.5A

10.0A / 9.5A

13.0A / 12.5A

16.5A / 16.0A

50°C

46°C

40°C

T0 : Outdoor Temperature

T0 (Control / Release)

10.0A / 9.5A

11.5A / 11.0A

14.5A / 14.0A

14.5A / 14.0A

17°C

12°C

5°C

[ Heating ]

T0 : Outdoor Temperature

T0 (Control / Release)

10.0A / 9.5A

11.5A / 11.0A

16.0A / 15.5A

18.0A / 17.5A

17°C

12°C

5°C

45,54LBTA

(Table 17 : Current Release Operation Value / Release Value)

(Control / Release)

[Heating]

900/880rpm 850/830rpm 780/750rpm 720/700rpm 570/550rpm 500/480rpm 370/350rpm 300/280rpm 220/200rpm

20°C < Ta

=

14.5A/14.0A

16.5A/16.0A

19.5A/19.0A

Outdoor unit fan speed (UP / LO)

Ta < 12°C

12°C < Ta < 20°C

=

Ta : Outdoor Temperature

MODEL